A 2014 meta-analysis of observational epidemiological studies found that garlic consumption is associated with a lower risk ofstomach cancer in the Korean population. Similarly, a 2013 meta-analysis of case-control studies and cohort studies found limited evidence suggesting an association between higher garlic consumption and a lower risk of prostate cancer. However, the association was only significant in the case-control studies and the authors noted there was evidence of publication bias.